Spark-plug.



W. ELLIS.

SPARK PLUG.

APPLICATION rILED MAR. 2a, 1914.

Patented Jan. 26, 1915.

Sli/wem fl'oz UNTTED STATES PATENT oFFICE.

wnfnr'eiu ELLIS, 'for nnN'ToN, oHIo.

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y his invention relates to spark plugs. The object of the invention is, inl a ready and. practical manner, to adapt a single spark plug for use in connection with two different systems of wiring, that is to `say magneto and battery, whereby in the event of the failure of one system to act the other may be instantly cut into activeservice.

A further object .of the invention .is t0 dispense with thefemployment of a binding post for establishing connection between the timer wire and the plug, in lieu thereof to employ a .novel form of snap clip, the terminals of the electrodes on the plug being so .formed as to 'adapt the. clip to be connected therein in such vmanneras t'o insure positive .contact `and thus `transmission of current, and at the same time preclude the possibility of disconnection in use.

tion is .better understood, the same consists,

,Y With the above and other objects in View, as will appear as the nature of thisinvengenerally stated, ina spark plug embodying l gland for` maintaining.

gend peeking n e Aplug:rigidly seated within the casing. E The plug has` extending through 4it two electrodes, .the upper end of each` of which carthe usual casing, porcelain p ries a ball-shaped terminal that is designed.

to be engaged by a snap clip carried by the timer wire, theconnection between the parts being such as^to` permit of lreadyassemblage l and disconnection as occasion may require.

As a matter of further and specific improvement, the lower'end of they casing is provided with two inward projecting fins or lugs that are designed to engage in grooves formed in a shieldprojectin from the lower end of the plug and beyon the casing, the coaction between theiins and' the grooves serving :to hold the plugs against turnin when the packing gland is being tightene f VFurther andy more specific details of construction will be hereinafter fully described and claimed., i

In the accompanymg drawmgs, forming a part of this .speei-iication, and. in which A I y Specification of Letters lfatent. e applicati@ med Haren 2s, i914. serial No. 825,907.

insulating .is tightened, the

connection with the electrode.

Patented Jan. 26, 1915.

like characters of lreference indicate corresponding parts: Figure 1 is a view in vertical longitudinal section through a Spark plug constructed in accordance with the present invention, the section being taken on the line :zi-m, Fig. 3. Fig. 2 is a bottom plan View thereof. Fig. 3 is a top plan view. Fig. 4 is an enlarged detail view, in side elevation, of the lower portion of the plug. Fig. 5 is a-bottom plan'vi'ew of the form of snap clip employed for connecting the timer wire either Jfrom the battery or magneto with the spark plug. Fig. (3 is a view in side elevation, partly in section, of the snap clip, showing it combined with tlfeterminal of one of the electrodes.

Thestructure comprises a casing 1, which as usual, is externally-threaded at its inner endfandV is provided at its outer endwith an internally threaded chamber to receive a packing 2 that lis borne upon by a gland 3, in order to insure a tight juncture between the packing and the core or plug 4, the latter being of porcelain. This plug projects at its outer and inner end beyond theplug and gland respectively, the vinner end constitut-y ing a shield 5 which will operate to prevent any'intererence between the two electrodes and the edge -ofthe 'shield beingprovided with longitudinal grooves or channels 5a that are Idesigned to be'engaged by iins or lugs -6 projecting inward from thel lower end of thezcasing, whereby when the gland plug will positively be held againstturning. v j -E: Xtending longitudinally through the plug are two electrodes 7 the inner .and outer ends of each of which are threaded,

and disposed upon the inner end of each ing shown in Fig. l', to receive nuts 11, the

object of the two nuts being to prevent the electrodes from being blown out in use. Each of the nuts ll'carries a ball-shaped terminallQ to constitute a substitute for the ordinary binding post usually em loyed in e he inner end ofthe casing is. provided with two electrodes 13 that coact with 'the electrodes. 7 in the usualmanner to produce a spark. As will be noted by reference to Fig. 1, the two balls are of dierent height, "the object of this arrangement being to permit two timer wires entering in the same direction to be connected wwith the ball terminals without interference, it being of course understood th'at at no time will both of the timer wires be connected with the terminals.

sidesl in the novel means for 'connecting the timer wires with the 'ball terminals, and thls consists, in connecting with each wire,

that is tol say to the one leading to the battei-y and the otherxleadingto the magneto, a collar 14 thatis cla ed or clamped around one end of a timer wire 15, and is provided with a tongue 16, the metal of which is struck out to provide two longitudinally disposed'ingers 17 and 18, the former-bging arranged in the collar and the latter in the outer end ofthe tongue, and projects into an opening 19 that is designed to receive the ball terminal. resilient, and the finger 17 serves effectively to clamp 44the strands 2Q of the timer wirev against the inner surface of the tongue, and l also operates to prevent the strands from` y becoming disconnected from the collarwhen with two vintuigned clamps `22 which will longitudinal strain-is applied to the vtimer wire. These strands, as shown in Fig. 6, are passed over the fingers 17 and then rearwardly betweenA one member offthe collar, Lwhich is asplit structure, and the outer surface of the insulation of the timer wire. The finger 18 is provided at its outer end with a curved notch 21 which will permit it to pass readily over the ball terminal when the 'snap clip is to be connected'there-v -with. #In order to prevent any strain on the timer wire from causing the strands 20 to deflect the finger 17 and thus loosen its vhold on the strand, the tongue is provided serve to act as guards to preventV any outward movement of the inger. 1 From the 'foregoing description it One of the essential features ofI theJ invention 'rev These ngers are distances beyond the core.

stood that if. preferred these latter may be integral with the electrodes, in which case the electrodes will'be inserted from the inner end of the plug, and the nuts 10 then turned upon the upper ends thereof. Y

The improvements herein deflnedY while simple in character willbe found thoroughly efficient for the, purposes designed, Aand will coaot in the production -of a spark attachment for internal combustion. engines that will be durable and thoroughly practi-` cal in operation and will require no change whatever 1n the construction and arrangementfo the engine to combine the same therewith. l

claiml; 1 ,Ly' p h.

spar p ug com rlslng a casing aving lugs extending within the casing at its inner end, an insulating core carried 'within the casing, electrodes extending longitudinally through the core, said core havin a longitudinally projecting web extending from its inner end between the inner ends of the electrodes, the edges of said web being formed with grooves to receive the lugs on 'the casing, whereby to hold the core agamst turning relative tothe casing, and the outer ends 4of said electrodes extending different In testimony' whereof I WILLIAM ELLES. A

hereunto aiix my. signature the 7presence of two witnesses. 

